body {
    position: fixed;
    top: 0;
    width: 100vw;
    height: 100vh;
    background: url('../images/background.jpg') no-repeat;
    background-size: 100%;
}

.logo {
    position: fixed;
    left: calc((100vw - 420px) / 2);
    top: 12vh;
    width: 500px;
    height: auto;
}
.logo .left {
    float: left;
    display: block;
    width: 100px;
    height: 100px;
}
.logo img {
    width: 100%;
}
.logo .right {
    margin-left: 20px;
    float: left;
    width: 300px;
}
.logo p {
    margin-left: 25px;
    margin-top: 12px;
    font-size: 2rem;
    color: #fff;
}
#box {
    position: fixed;
    top: calc((100vh - 330px) / 2);
    left: calc((100vw - 600px) / 2);
    width: 600px;
    height: 350px;
    background-color: rgba(128, 128, 128, 0.438);
    border-radius: 8px;
}


#box  .input-wrapper {
    width: 70%;
    height: 15%;
    margin: 0 auto;
    margin-top: 2.8rem;
    line-height: 6.5vh;
    background-color: rgba(255, 255, 255, 0.26);
}
#box  .input-wrapper input {
    width: 300px;
    height: 6vh;
    outline: none;
    border: none;
    margin-left: .8rem;
    color: #fff;
    font-size: 1.1rem;
    background-color: transparent; 
}
#box  .input-wrapper input::-webkit-input-placeholder {
    color: #fff;
    font-size: 1.1rem;
}
#box .choice {
    width: 70%;
    height: 7vh;
    margin: 0 auto;
    color: #fff;
    line-height: 7vh;
}
#box .choice .remmember {
    width: 1rem;
    border: 1px solid red;
}
#box .choice .forget {
    display: block;
    float: right;
    color: #fff;
    text-decoration: underline;
}
#box .btn {
    width: 70%;
    height: 13%;
    margin-left: 5.5rem;
    background-color: #3f89ec;
    border: 1px solid #3f89ec;
    border-radius: 3px;
    color: #fff;
    font-size: 1.2rem;
    cursor: pointer;
}

#tips {
    width: 390px;
    margin: 0 auto;
    margin-top: 14px;
    color: red;
}